NLFT cadres and All Tripura Tiger Force (ATTF) militants undergo arms training in hideouts in Bangladesh which shares an 856-km border with Tripura.

Banned in 1997 by the union home ministry, the two outfits advocate secession of Tripura from India. ATTF, however, has become almost defunct due to the surrender of most of its cadres.

A senior police official, citing intelligence reports, said that Bangladesh Army and security forces in separate raids have recently busted two different camps of NLFT and National Socialist Council of Nagaland (Isak-Muivah faction) in mountainous Chittagong Hill Tracts.